This 0°F mummy hits a value sweet spot: It offers no-compromise warmth and weather protection at a price that’s lower than most other down, waterproof/breathable winter bags. Granted the secret is less-compressible 600-fill down, which packs about 25 percent bulkier than an 800-fill bag, but you sacrifice nothing else. When one tester was camped at 11,500 feet in Colorado’s Arapahoe National Forest with temps approaching zero, he utilized the smart footbox pocket for chemical heat packs, and brought in a hot-water bottle.
“An hour later I had to take out the heat pack and the bottle, and remove my beanie, because I was so warm,” he says. “I stayed toasty till morning without them.” The proprietary MemBrain shell kept the insulation dry, even when tent condensation rained down all night. The two-way zipper allows venting from top or bottom, and the stiff, double-layer zipper guard was so effective that the puffy draft tube never got jammed.
Only drag: It’s slightly bulky, about the size of a medium watermelon. $329; 4 lbs. 2 oz. (long); reg. and long; marmot.com